package cn.tedu._05weibo.common.interceptors;

import cn.tedu._05weibo.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Slf4j
public class UserLoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /*
        登录状态校验:使用拦截器方式实现;
        1.获取会话:session
        2.利用session获取UserVO;
        3,判断userVO是否为空值:
          3.1 为空:重定向到登录页面login.html;
          3.2 非空:return true;
         */
        log.debug("通过拦截器登录校验");
        HttpSession session = request.getSession();
        UserVO userVO = (UserVO) session.getAttribute("user");
        if (userVO==null){
            response.sendRedirect("/login.html");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
